A Novel Anion Doping for Stable CsPbI2Br Perovskite Solar Cells with an Efficiency of 15.56% and an Open Circuit Voltage of 1.30 V |
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Authors: | Huan Zhao Yu Han Zhuo Xu Chenyang Duan Shaomin Yang Shihao Yuan Zhou Yang Zhike Liu Shengzhong Liu |
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Institution: | Huan Zhao,Yu Han,Zhuo Xu,Chenyang Duan,Shaomin Yang,Shihao Yuan,Zhou Yang,Zhike Liu,Shengzhong (Frank) Liu |
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Abstract: | The Cs‐based inorganic perovskite solar cells (PSCs), such as CsPbI2Br, have made a striking breakthrough with power conversion efficiency (PCE) over 16% and potential to be used as top cells for tandem devices. Herein, I? is partially replaced with the acetate anion (Ac?) in the CsPbI2Br framework, producing multiple benefits. The Ac? doping can change the morphology, electronic properties, and band structure of the host CsPbI2Br film. The obtained CsPbI2?x Br(Ac)x perovskite films present lower trap densities, longer carrier lifetimes, and fast charge transportation compared to the host CsPbI2Br films. Interestingly, the CsPbI2?x Br(Ac)x PSCs exhibit a maximum PCE of 15.56% and an ultrahigh open circuit voltage (Voc) of 1.30 V without sacrificing photocurrent. Notably, such a remarkable Voc is among the highest values of the previously reported CsPbI2Br PSCs, while the PCE far exceeds all of them. In addition, the obtained CsPbI2?x Br(Ac)x PSCs exhibit high reproducibility and good stability. The stable CsPbI2?x Br(Ac)x PSCs with high Voc and PCE are desirable for tandem solar cell applications. |
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Keywords: | anion doping CsPbI2Br high efficiency high open circuit voltage inorganic perovskite solar cells |
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